Heater for sealing process of secondary battery

Abstract

A disclosed heater for a sealing process of a secondary battery includes: a sealing bar heating and pressing a pouch foil to be sealed; a plurality of sub-heating unit longitudinally disposed inside the sealing bar to respectively independently supply heat to a plurality of sections separated in the longitudinal direction of the sealing bar; temperature sensing units disposed inside the sealing bar and sensing temperature at positions on the surfaces being in contact with the pouch foil; and a control unit controlling heating temperature of the plurality of sub-heating units on the basis of the temperature sensed by the temperature sensing units.

What is claimed is: 
     
       1. A heater for a sealing process of a secondary battery, the heater comprising:
 a sealing bar heating and pressing a pouch foil to be sealed; 
 a plurality of sub-heating units longitudinally disposed inside the sealing bar to respectively independently supply heat to a plurality of sections separated in the longitudinal direction of the sealing bar; 
 temperature sensing units disposed inside the sealing bar and sensing temperature at positions on surfaces being in contact with the pouch foil; and 
 a control unit controlling heating temperature of the plurality of sub-heating units on the basis of the temperature sensed by the temperature sensing units, 
 
       wherein heat dissipation efficiency of the sealing bar decreases toward both longitudinal ends from a center portion thereof. 
     
     
       2. The heater of  claim 1 , further comprising a common heating unit longitudinally disposed inside the sealing bar to supply heat to all of the sections covered by the plurality of sub-heating units. 
     
     
       3. The heater of  claim 2 , wherein the sealing bar has an accommodation groove in which the common heating unit is disposed, and the plurality of sections to which heat is supplied by the plurality of sub-heating units covers the entire length of the accommodation groove. 
     
     
       4. The heater of  claim 2 , wherein the common heating unit and the plurality of sub-heating units each have a current controller controlling an amount of input current, and are independently controlled by the current controllers. 
     
     
       5. The heater of  claim 2 , wherein the common heating unit and the plurality of sub-heating units are heat coils. 
     
     
       6. A heater for a sealing process of a secondary battery, the heater comprising:
 a sealing bar heating and pressing a pouch foil to be sealed; 
 a plurality of sub-heating units longitudinally disposed inside the sealing bar to respectively independently supply heat to a plurality of sections separated in the longitudinal direction of the sealing bar; 
 temperature sensing units disposed inside the sealing bar and sensing temperature at positions on surfaces being in contact with the pouch foil; and 
 a control unit controlling heating temperature of the plurality of sub-heating units on the basis of the temperature sensed by the temperature sensing units, 
 wherein the plurality of sub-heating units is arranged such that gaps therebetween increase toward a center portion from both longitudinal ends of the sealing bar.